FIGHT Week for this Saturday’s heavyweight world championship blockbuster began in earnest on Wednesday with a public workout in front of an excitable pro-Joshua crowd at London’s Wembley Arena, just steps from sold-out Wembley Stadium where undefeated champion Anthony Joshua and long-reigning kingpin Wladimir Klitschko will square off in the most significant heavyweight event in more than a decade.

Big-punching Joshua (18-0, 18 KOs) and Klitschko (64-4, 54 KOs) will unify the heavyweight division as they meet for Joshua’s IBF world championship and the vacant WBA world championship.